Thermostat.



G. P. WILD.

THERMOSTAT. APPLICATION FILED MAR 11, 1911.

WITNESSES ATTORNHS 2'6 I 5 IV'NTDR v 23 BY 35M STATES PATENT OFFICE.

GttN'rHEn. PHILIP. WILD, or PHILADELPHIA, rsmwsyLvamayassrsuon To FRED- ERICK w. scnmnr, or PHILADELPHIA, PENNSYLVANIA.

. THE MQSTAT.

To all whom itmay "concern: .1 1 Be it known that I, Giixrrnza P11111112 "VVILD, a citizen of the United States." resid- Schmidt.

ing in thecity and county of Philadelphia. State of'fPennsylvania, have invented .a new and useful Thermostatiof h, he follow". g is & pecification. I

My invention consists of an improved clovsure for thermostats of'the character dis: .c-l'osed in Letters Patent, Nos.

Y 976,75. 976,748 and 976,749, granted on the 22nd "dav vof November, 1910, to Frederick vW.

It further consists of improved means for connectlng an electrical. conductorzto-such thermostat.

1. fully set forth. i v For the purpose of'lllustratin'g my invenown, I have shown in the accompanying,

of construction all as will drawings one form thereof which isqat pres- ,entpreferred by me. since the same has been i found in practice to give satisfactory and v reliable reSults,-although it is to be understoodthatthe various instruinentalit-ies of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and] organization of these instrulnentalities: as herein shown and described.

lfigurel represents an end view of a thermost-atembodyingmy invention; Fig. 2

- 1 1, .usuallj of bras represents a vertical section of the same.

Thetherinosta't h: a metallic base-plate,

one: end, into which one end. of a composite metal thermostat-bar. is secured. .The

have contact,'wlie11' thefbaris flexed owing to the dif erence in the coe'flieients of expanmed fro n the base-plate.

sion of the two nietals from which the bar is formed. with a coutactxpoint, 5. of the same inetal and secured to the end of a con-1 threaded, to be Z'LthUStEd to bring its point nearer to or farther from the contact-point of the thermostat-bar in a 50 yoke or bracket. 7. secured uponbut insu .and. thermostat are i-nclosedin'the body, 8 1 of a casmg, preferably ot'rectangular form.

' and having a cover, 9, p .to the upper edgesot't he SldQ WHllS, and

secured liquid-tight It. further consists of other novel features be" herelnafter rings short post, 2. at.

nected' to the upper end of the stud by h means of a bindings-crew, Z5 1.v The outer end \Q The base-plate I p Specification ofl etters'latent. Patented Dec. 26, 1911;

p lication filed March 8, 1911. SerialNo. 613,018..

said cover which forms .awall' of the casing k has an opening, 10, registering withithe head of the contact screw and closedby a} seal. 11. The casing: and, cover are' formed from anacid-res'isting and electrically-con ducting material, such as lead, which(has been found in practiceto'be; the'best mate rial, and; the cover is formed. preferable at its lniddle. with'-a domed and flanged neck. '12. havinga shouldered seat, 13, in its top opening. ;Thebottoni opening of the necks is formed with an annular shouldered sea-t,

l4, againstwhich an annular disk, 15',pref-f erablv of lead, is seated to form a closed chamber within such neck. A flanged stud.

16, preferably of brass. has its reduced lower" end; passed through the central opening' in" lsaid disk and has its'flange seated against; Y

the upper face of the disk with a mica Washer. 17, and a rubber washer or gasket,

18. interposed. A wire. 19. is secured upon the contact-screw and bracket of the therinostatby a nut 20. and has its other end connected to the-stud by a binding screw, 21,

threaded into the lower end of a screw threaded axial bore. 22. in the stud; and hav-.

ing its head bearing against a metal washer, 7 1 23,;whieh has a mica washer. 2i, and a rub. ber washer or gasl et. 95. interposedbetween; it and the underside of the annular disk.-

A sleeve. 26. of mica. insulates thereduc'ed lower end of the stud from the annular disk. A tube or tubular rib, 2, is formed upon 7 the'upper side'of the cover. extending from the neck to one end. of the salnegand has a regime inal' bore which conummicates with the interior of the chamber. in the nec-l .;-'A-. lead-covered cable has its leaden covering soldered into the bore of the tube, and contains a whe -'29, having rubber insula= U011. 30. The inner end of this wire is cong ofthe bore in the tube onrib is beveled or flared. as at 27.".to 2110mm cable freedom 190 of pla and to prevent it frombeingcutah the entrance into the bore. The casing has a filling. 32. of liquid hydrocarbon which is a non-conduc'torof electricity and a conductor of 'heat. and also serves to; quench .arc s;105

formed be'tweenthe thermostat contacts. and

the neck has a filling. of parafiin orsirni .lar fusible and electrically non-conducting materialwhich :is poured in a melted state into the; neck, through its top opening, I which l 10 automatic control until the battery is burned vice is liable to be broken off, and the chargthe neck and tube or rib. The binding post after the solder securing secured by the binding-screw. after the. wire thermostat, a cable secured in said tube and is thereupon closed by a leaden seal, 34,\ fused or soldered into the seat of the openmg. 5

Thermostats of this character and employed for controlling the charging of storage batteries for electric vehicles are usually handled by persons without the technical knowledge or ethical inclination to exercise care, andI have found from the use of thermostats, such as disclosed in the. above-named patents, under ordinary working conditions for controlling the char ing of storage batteries for electrically prope led trucks, that uncovered binding posts are liable to be broken off from rough usage and are liable to get quickly fouled and thus fail to provide proper contact. In such exposed binding posts, a portion of the wire connected thereto is uncovered to provide contact and will be exposed to the action of the battery solution. For these reasons the connection between the thermostat and the circuitbreaking device for the charging de ing-of the battery may be continued without out. In my present device, and the wire connection violence and injurious the binding post is protectedagainst action of the acid by is accessible for first securing the .WIIG through the opening in the neck, which is thereupon scaled up and the post and wire require no further attention. as they are subiect to no strain or action of the solution. If for some reason the cable breaks. it may be suitably spliced, and. if it breaks directlv at the end of the tube. the solder securing it may be fused by external application of heat to the rib and the cable pulled out. the seal of the neck has been fused. the seal removed. the paraffin filling melted and poured out, and the binding screw unscrewed, whereupon the new end of the wire may be inserted and has been stripped of its covering for a suitable distance and an eve has been formed from such stripped end. The chamber in the ne'ck may now be again filled and the seal replaced;

Ha ing thus described my invention what I claim as new and desire to secure by Let ters Patent. is

1. In a device of the character stated. an acid-resisting and electricallv-conductive casing. a thermostat within the same and having one contact electrically connected with the same. a cover for the casing and having a closed chamber formed upon it. a tube upon the cover and communicating with such chamber; a binding post in the chamber and connected to a contact ofthe the tubular rib and ductor within it'connected to theb1nd1ngsoldered within the tube, a binding-post within the chamber other contact of the thermostat. and securing the. conductor of the cable, and a filling within the chamber of fusible and non-conductive material.

3. Ina device of the character stated, an

acid-resisting and electrically conductive cas1ng,'an acid-resisting and electrically,

conductive cover secured upon the same and formed with a closed chamber and with a tubular rib communicating with said chamber, a thermostat within the casing and electrically connected to the same, a binding post in the chamber of the cover and connected to the other contact of the thermostat, a lead-covered cable soldered within having an insulated conpost, and a filling of fusible and insulating material within the chamber.

4. In a device of the character stated, an acid-resisting and electrically-conductive casing having one wall formed with a closed chamber and a tube leading into such chamber, a thermostat having one contact electrically connected to the same. a binding post in the chamber and electrically connected to the other contact of the thermostat, a cable secured in the tube and having an insulated conductor connected to the binding-post, and a fusible and insulating filling within the chamber.

'5. In a device of the character stated, an

and connected to the within such casing and i acid-resisting and electrically conductive casing having a wall formed with a cham-' her and with a tube communicating with suchchamber, a thermostat within the easing and having one contact electricallyconne'cted to the same, an annular disk closing the communication between the interior of the casing and of the chamber, a stud secured in and insulated from the disk, a wire connected to the other contact of the thermostat, a binding-screw screwed into the inner end of the stiid and securing the other end of the wire to it, alead-covered cable secured in the tube and having an insulated conductor within it, a binding screw screwed into the outer end of the stud and securingv the end of such conductor, and fusible and non-conducting the chamber.

a filling within an acid-resisting and electrieally-conductive casing having a Wall formed with a chamher and with a tube communicating with suchchainber a thermostat within the easing and having one contact electrically connected to the same, an annular disk securedto close the opening between the interior of the asing and the chamber, a flanged stud having its inner end projecting through the opening in the annular disk,-

insulating and packing washers upon the ini ner end of the stud, a metallic washer bearingagainst the same a wire hax'ing one end connected to the other contact of the thermostat, a binding screw screw-threaded into the inner end of the stud and securing said wire and washers against the inner side of thetannular disk, insulating and packing washers between the flange of the stud and the annulardisk, a cable soldered in the tube and having an insulated conductor, a binding-screw screw-threaded into the outer end ofthe stud and'securing the end of the conductor to the same, and a fusible and noneonducting filling in the chamber.

GUNTHER PHILIP WILD.

\Vitnesses C. D. MCVAY,

F. A. NEwToX. 

